Practice paper · Bengaluru region

During pollination, plants ensure that the pollen grain from a species germinates on the stigma of the same species. Which of the following ensures this?

1. Ahydrotropism
2. Bchemotropism
3. Cphototropism
4. Dgeotropism

Which of the following statements is/are true about a neuron?

1. (i)
   Dendrites of neuron pass the impulse to the axon.
2. (ii)
   Axon of neuron carries the impulse from the cell body.
3. (iii)
   Sensory neuron carries the impulse to the specific effectors.
4. (iv)
   Transmission of impulse from a neuron to a muscle fibre occurs through neuro-muscular junction.

When an ‘X’ bearing sperm fertilizes the egg, the resulting zygote has the following combination of chromosomes:

1. A44 + XX
2. B44 + XY
3. C22 + XX
4. D22 + XY

If the total energy at the trophic level of producers in an ecosystem is ‘E’, then which of the following corresponds to the energy available to the tertiary consumers?

1. AE/10
2. B10 x E
3. CE/1000
4. D1000 x E

The action of which among the following is crucial to the formation of ozone?

1. AHumans
2. BSunlight
3. CCarbon dioxide
4. DChlorofluorocarbons

Assertion (A): In the human heart ventricles have thicker muscular walls than atria. Reason (R): Ventricles have to pump the blood into various organs.

1. ABoth A and R are true, and R is the correct explanation of A.
2. BBoth A and R are true, and R is not the correct explanation of A.
3. CA is true but R is false.
4. DA is false but R is true.

Assertion (A): Offsprings produced by sexual reproduction show variation. Reason (R): Each offspring produced by sexual reproduction inherits all the genes from each parent.

1. ABoth A and R are true, and R is the correct explanation of A.
2. BBoth A and R are true, and R is not the correct explanation of A.
3. CA is true but R is false.
4. DA is false but R is true.